Cool water is better than cold water, generally (maybe that's why they aren't drinking it). When it's really hot, I add ice just to keep their water form getting hot, though...
They might be fine - watch their behavior more than the thermometer - give them lots of shade and fresh cool water, and let them find their comfort zones. I generally don't mess with them or handle them if I don't have to when it's really hot - minimize stress.
If you are worried about them and they seem very uncomfortable, fill a pan with cool (not cold) water and hold them with their feet and legs in it. In my experience, some love it immediately, others struggle a bit, but almost always they stop panting in about a minute or two. Don't use cold water because it'll cause the blood vessels to constrict. You want the blood flow to the legs to circulate, cooling the body.
If you think you have a chicken with heat stroke (acting uncoordinated, not standing up, etc.), dunk their whole body (not head) in a bucket of cool (NOT COLD) water to save them.
Where do you live? Where I am the humidity tends to be low when it's very hot, so misters work well for me.
